EUVD-2026-56913
GHSA-q985-47v7-9c79
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Requires authenticated write access (PR:L) and concurrent timing to win the race condition (AC:H); impact is solely server availability via crash.
Primary rating from Vendor (mongodb).
CVSS VectorVendor: mongodb
Lifecycle Timeline
3DescriptionCVE.org
An issue in MongoDB Server's geospatial validation could allow an authenticated user with write privileges to cause an internal reference to be used after the underlying memory has been freed, through concurrent operations against a collection using a certain type of validator. This could result in a server crash, leading to a denial of service.
AnalysisAI
Use-after-free in MongoDB Server's geospatial validation subsystem allows an authenticated user with write privileges to crash the database server through concurrent operations against a collection using a specific validator type. Affected branches are MongoDB 7.0 (prior to 7.0.40), 8.0 (prior to 8.0.29), and 8.3.x (prior to 8.3.8), per EUVD advisory EUVD-2026-56913. No public exploit code exists and SSVC assessment indicates no current exploitation activity; patched releases are available from MongoDB.
Technical ContextAI
CWE-416 (Use After Free) describes a memory safety violation where a program continues to reference memory after it has been freed, leading to undefined behavior. In this case, MongoDB Server's geospatial validation logic contains a race condition: when concurrent write operations are submitted against a collection configured with a specific geospatial validator type, an internal reference can be retained and dereferenced after its backing memory allocation has been released. The CVSS 4.0 vector's AT:P metric confirms that a specific attack timing or configuration prerequisite is required - the race must be won. Affected products are identified via CPE cpe:2.3:a:mongodb:mongodb_server:*:*:*:*:*:*:*:* spanning the 7.0, 8.0, and 8.3 release trains. The root cause is in the server-side geospatial validation path, not in a client library.
RemediationAI
Upgrade MongoDB Server to 7.0.40, 8.0.29, or 8.3.8 depending on the deployed release branch; these are the confirmed fix versions per vendor advisory EUVD-2026-56913. The MongoDB Jira issue SERVER-130117 at https://jira.mongodb.org/browse/SERVER-130117 should be consulted for release notes and patch confirmation. Where immediate upgrade is not possible, a compensating control is to restrict write access on collections that use geospatial validators to the minimum required set of service accounts, reducing the pool of principals capable of triggering the race; note this limits functionality for legitimate writers. Disabling geospatial validators on affected collections eliminates the vulnerable code path entirely but removes validation enforcement, which may be a security or data-quality regression depending on application requirements.
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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